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The present study investigated the modification of mesoscale inhomogeneous distribution of soil wetness, resulting from mesoscale irrigation over arid or semiarid lands in mid-latitude in the later summer or early autumn, on mesoscale climate under conditions with and without synoptic flow influence, using an interactive model between soil and atmosphere. The simulations indicated that after a mesoscale irrgation, a wet soil breeze circulation was thermally forced, which was, in many features, similar to that of the sea breeze circulation. The influence of synoptic flows on the structure of thermally-induced wet soil breeze circulation was also discussed.